. >> when you're president of the united states you are president of all the people. not just the president who voted for you. >> reporter: and president obama had a similar response during tonight's appearance with david letterman. the president said romney is writing off a big chunk of the country. >> my expectation is if you have to be president you have to work for everybody not just for some. >> mitt romney's comments were first made public by mother jones, the news organization based in san francisco. and the attention its received has been global. >> pretty phenomenal. we've had double the traffic of our previous biggest day ever. we've been picked up by news outlets all over the world. >> reporter: the magazine's website usually gets 250,000 page views per day. but yesterday it had 2 million. the editor of mother jones says they received the video a few weeks ago then spent time discussing what to do with it. she also said they assured the source of privacy. >>> a new report out today reveals startling statistics on obesity in america. here is what the researc